B．efore performing any maintenance on a hydraulic system storing energy in an accumulator, you should

A．pressurize the system to test for leaks

B．bleed off all pressure within the system

C．operate the machine until it reaches normal temperature

D．disconnect the pump pressure control switch

[单选题]B．efore doing any work on a hydraulic system equipped with accumulators, you shouldA．drain the accumulators and purge with oxygenB．bleed off all stored energy from the accumulators completelyC．charge the accumulators to prevent system energy lossD．pu

[单选题]Before starting any diesel or gasoline engine，which of the following must be checked? （）A . Oil levelB . Flow of cooling waterC . Exhaust dischargeD . All of the above

[单选题]Before the construction of the road, it was prohibitively expensive to tran

[单选题]Students must apply for a place before attending any class．Applications，eit

[单选题]Students must apply for a place before attending any class．Applications，eit

[单选题]Students must apply for a place before attending any class．Applications，eit

[单选题]Students must apply for a place before attending any class．Applications，eit

[单选题]Students must apply for a place before attending any class．Applications，eit

[单选题]Maintenance activitiesinclude ( ) .A.making enhancements to software produc

[单选题]Performing（）involves monitoring specific project results to determine if they comply with relevant quality standards and identifying ways to eliminate causes of unsatisfactory results.A . qualityplanningB . qualityassuranceC . qualityperformanceD . q